export function formatDate(time, pattern) {
    var date = new Date(time)
    if (/(y+)/.test(pattern)) {
        pattern = pattern.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length))
    }
    let o = {
        'M+': date.getMonth() + 1,
        'd+': date.getDate(),
        'h+': date.getHours(),
        'm+': date.getMinutes(),
        's+': date.getSeconds()
    }
    for (let key in o) {
        if (new RegExp(`(${key})`).test(pattern)) {
            let str = o[key] + ''
            pattern = pattern.replace(RegExp.$1, RegExp.$1.length === 1 ? str : strReplace(str))
        }
    }
    return pattern
}

function strReplace(str) {
    return ('00' + str).substr(str.length)
}
